<?php
require_once __DIR__ . "/../../config/bootstrap.php";
require_once __DIR__ . '/../../src/AdminAuth.php';
AdminAuth::requireLogin();

$pageTitle = "Journaux serveur";

// ── Log file definitions ──────────────────────────────────────────────────────
// Paths match the nginx config (posterg_access.log / posterg_error.log).
// On the dev server these files won't exist; we handle that gracefully.
const LOG_FILES = [
    'nginx_error'  => ['label' => 'nginx — erreurs',   'path' => '/var/log/nginx/posterg_error.log'],
    'nginx_access' => ['label' => 'nginx — accès',     'path' => '/var/log/nginx/posterg_access.log'],
    'php_error'    => ['label' => 'PHP-FPM — erreurs', 'path' => '/var/log/php8.4-fpm.log'],
];

const ALLOWED_LINES = [50, 100, 200, 500];

// ── Input validation ──────────────────────────────────────────────────────────
$selectedKey  = $_GET['log']   ?? 'nginx_error';
$selectedN    = isset($_GET['n']) ? (int) $_GET['n'] : 100;

if (!array_key_exists($selectedKey, LOG_FILES)) {
    $selectedKey = 'nginx_error';
}
if (!in_array($selectedN, ALLOWED_LINES, true)) {
    $selectedN = 100;
}

$logDef  = LOG_FILES[$selectedKey];
$logPath = $logDef['path'];

// ── Read log ──────────────────────────────────────────────────────────────────
$lines     = null;   // null = unavailable, [] = empty, [...] = lines
$readError = null;

if (!function_exists('exec')) {
    $readError = "exec() est désactivé sur ce serveur.";
} elseif (!file_exists($logPath)) {
    $readError = "Fichier introuvable : " . htmlspecialchars($logPath);
} elseif (!is_readable($logPath)) {
    $readError = "Fichier non lisible (permissions insuffisantes) : " . htmlspecialchars($logPath);
} else {
    $output = [];
    $rc     = 0;
    // tail -n N ensures we never load the whole file into memory
    exec('tail -n ' . intval($selectedN) . ' ' . escapeshellarg($logPath) . ' 2>/dev/null', $output, $rc);
    if ($rc !== 0) {
        $readError = "Erreur lors de la lecture du fichier journal.";
    } else {
        // Reverse so newest lines appear first
        $lines = array_reverse($output);
    }
}

// ── File metadata ─────────────────────────────────────────────────────────────
$fileMeta = null;
if (file_exists($logPath)) {
    $size      = filesize($logPath);
    $mtime     = filemtime($logPath);
    $fileMeta  = [
        'size'  => $size > 1048576
            ? number_format($size / 1048576, 2) . ' MB'
            : number_format($size / 1024, 1) . ' KB',
        'mtime' => date('d/m/Y H:i:s', $mtime),
    ];
}

// ── Log-level classifier (for nginx error log coloring) ───────────────────────
/**
 * Returns a CSS class based on the log level token in a log line.
 * nginx error lines look like: 2024/01/15 12:34:56 [error] 1234#1234: …
 * nginx access lines: 1.2.3.4 - - [15/Jan/2024:12:34:56 +0000] "GET / HTTP/1.1" 200 …
 */
function logLineClass(string $line): string {
    // nginx error log: [crit], [error], [warn], [notice], [info], [debug]
    if (preg_match('/\[(crit|emerg|alert)\]/', $line))  return 'log-crit';
    if (preg_match('/\[error\]/', $line))                return 'log-error';
    if (preg_match('/\[warn\]/', $line))                 return 'log-warn';
    if (preg_match('/\[notice\]/', $line))               return 'log-notice';
    // access log: highlight HTTP 4xx / 5xx
    if (preg_match('/" [45]\d\d /', $line))              return 'log-error';
    if (preg_match('/" 3\d\d /', $line))                 return 'log-notice';
    return '';
}

require_once APP_ROOT . '/templates/admin/head.php';
?>

<style>
/* ── Log viewer layout ─────────────────────────────────────────────────── */
.log-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .6rem;
    margin-bottom: 1.25rem;
}
.log-toolbar select,
.log-toolbar input[type=submit] {
    background: var(--admin-bg-alt);
    border: 1px solid var(--admin-border);
    color: var(--admin-text);
    border-radius: 4px;
    padding: .4rem .7rem;
    font-size: .85rem;
    font-family: inherit;
}
.log-toolbar select:focus { outline: 2px solid var(--admin-purple); }
.log-toolbar input[type=submit] {
    cursor: pointer;
    background: var(--admin-purple);
    border-color: var(--admin-purple);
    color: #fff;
    font-weight: 600;
}
.log-toolbar input[type=submit]:hover { opacity: .85; }

.log-meta {
    font-size: .78rem;
    color: var(--admin-text-muted);
    font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
    margin-bottom: .75rem;
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}
.log-meta span::before { content: attr(data-label) ": "; opacity: .6; }

.log-unavailable {
    background: var(--admin-bg-alt);
    border: 1px solid var(--admin-border);
    border-radius: 4px;
    padding: 1.5rem;
    color: var(--admin-text-muted);
    font-size: .88rem;
}
.log-unavailable .log-unavail-path {
    font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
    font-size: .8rem;
    margin-top: .4rem;
    opacity: .7;
}

.log-empty {
    color: var(--admin-text-muted);
    font-size: .88rem;
    padding: 1rem 0;
}

/* Log output block */
.log-output {
    background: #0d0d0d;
    border: 1px solid var(--admin-border);
    border-radius: 4px;
    padding: 1rem;
    overflow-x: auto;
    font-family: ui-monospace, "SFMono-Regular", Consolas, "Courier New", monospace;
    font-size: .76rem;
    line-height: 1.55;
    max-height: 72vh;
    overflow-y: auto;
    /* Reverse scroll so newest (first in DOM) is at top */
}

.log-line {
    display: block;
    white-space: pre;
    padding: .05rem .1rem;
    border-radius: 2px;
    color: #bbb;
}
.log-line + .log-line { border-top: 1px solid rgba(255,255,255,.03); }

.log-crit   { color: #ff7070; background: rgba(200,0,0,.12); }
.log-error  { color: #f08080; }
.log-warn   { color: #ffd080; }
.log-notice { color: #a0c8ff; }

/* line number gutter */
.log-line::before {
    content: attr(data-n);
    display: inline-block;
    min-width: 4ch;
    margin-right: .75rem;
    opacity: .3;
    text-align: right;
    user-select: none;
}

.log-count-badge {
    background: var(--admin-bg-alt);
    border: 1px solid var(--admin-border);
    border-radius: 3px;
    font-size: .76rem;
    padding: .15rem .5rem;
    color: var(--admin-text-muted);
    font-family: ui-monospace, monospace;
}
.log-refresh-note {
    font-size: .78rem;
    color: var(--admin-text-muted);
    margin-bottom: 1.25rem;
}
.log-refresh-note a { color: var(--admin-purple); text-decoration: none; }
.log-refresh-note a:hover { text-decoration: underline; }
</style>

<main class="admin-main">
    <h1 class="admin-page-title">Journaux serveur</h1>

    <p class="log-refresh-note">
        Affiché le <?= date('d/m/Y à H:i:s') ?> —
        <a href="?log=<?= htmlspecialchars($selectedKey) ?>&amp;n=<?= $selectedN ?>">Rafraîchir</a>
    </p>

    <!-- Toolbar: log selector + line count -->
    <form class="log-toolbar" method="get" action="">
        <select name="log" aria-label="Fichier journal">
            <?php foreach (LOG_FILES as $key => $def): ?>
            <option value="<?= htmlspecialchars($key) ?>"
                <?= $key === $selectedKey ? 'selected' : '' ?>>
                <?= htmlspecialchars($def['label']) ?>
            </option>
            <?php endforeach; ?>
        </select>

        <select name="n" aria-label="Nombre de lignes">
            <?php foreach (ALLOWED_LINES as $n): ?>
            <option value="<?= $n ?>" <?= $n === $selectedN ? 'selected' : '' ?>>
                <?= $n ?> dernières lignes
            </option>
            <?php endforeach; ?>
        </select>

        <input type="submit" value="Afficher">

        <?php if ($lines !== null && count($lines) > 0): ?>
            <span class="log-count-badge"><?= count($lines) ?> ligne(s)</span>
        <?php endif; ?>
    </form>

    <!-- File metadata -->
    <?php if ($fileMeta): ?>
    <div class="log-meta">
        <span data-label="Fichier"><?= htmlspecialchars($logPath) ?></span>
        <span data-label="Taille"><?= $fileMeta['size'] ?></span>
        <span data-label="Modifié"><?= $fileMeta['mtime'] ?></span>
    </div>
    <?php endif; ?>

    <!-- Output -->
    <?php if ($readError !== null): ?>
        <div class="log-unavailable">
            <strong>Journaux non disponibles</strong>
            <div class="log-unavail-path"><?= $readError ?></div>
            <?php if (php_sapi_name() === 'cli-server'): ?>
            <div style="margin-top:.6rem;font-size:.8rem;opacity:.7;">
                En environnement de développement, les logs nginx ne sont pas disponibles.
                Cette page est pleinement fonctionnelle sur le serveur de production.
            </div>
            <?php endif; ?>
        </div>

    <?php elseif (empty($lines)): ?>
        <div class="log-empty">Le fichier journal est vide.</div>

    <?php else: ?>
        <div class="log-output" role="log" aria-live="off" aria-label="Contenu du journal">
            <?php foreach ($lines as $i => $line): ?>
            <span class="log-line <?= logLineClass($line) ?>"
                  data-n="<?= count($lines) - $i ?>"><?= htmlspecialchars($line, ENT_QUOTES | ENT_SUBSTITUTE) ?></span>
            <?php endforeach; ?>
        </div>
    <?php endif; ?>

</main>

<?php require_once APP_ROOT . '/templates/admin/footer.php'; ?>